A mistake in former Secretary of State Hillary Clinton’s schedules around the time of the 2012 Benghazi, Libya attacks may explain how the documents were kept hidden until now.

According to those schedules, Clinton spent the week prior to the attack traveling through southeast Asia and Russia as conditions in Libya deteriorated.

Clinton met with various foreign ministers and presidents during the week, in addition to attending the APEC Economic Leaders Meeting, where she signed a Memorandum of Understanding on U.S.-Russian Cooperation in the Antarctic and a Joint Statement on Strengthening U.S.-Russian Inter-Regional Cooperation.

In response, State Department officials told Citizens United, a conservative non-profit group, that the agency does not correct inaccurate records during the FOIA process and only produces the files as they appear in government archives.

While seemingly an innocent mistake, the error could have shielded Clinton’s schedules from disclosure for years. Consequently, anyone looking for calendars specifically from those dates may have been told no such records existed.

The State Department only turned over the schedules because Citizens United and the Associated Press requested all of Clinton’s calendars. Otherwise, the records may have remained hidden indefinitely.

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The mistake, according to State Department officials, occurred back in 2012 due to a filing error on behalf of someone on Clinton’s staff.

While possibly a unintentional filing error, this mistake next to claims that Clinton deleted emails while under Congressional subpoena has raised further suspicion.

Per WikiLeaks, State Department officials were still discussing which emails to delete — apparently to avert the subpoena.

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WikiLeaks recently released emails from the account of Clinton campaign manager John Podesta. They reveal Clinton campaign staffers discussing which material to turn over in response to a subpoena of Clinton’s emails.

Coupled together, the incidents raise questions for the Clinton campaign and her State Department.

“Accuracy matters,” J.T. Mastranadi, political director for Citizens United, told the Washington Examiner. “The State Department should explain this error to the American people in detail and correct the record immediately.”